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Finding the Fourth Proportional to 331.30, 496.92 and 87.85

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Solution

The fourth proportional to 331.30, 496.92 and 87.85 is: 131.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.30 : 496.92 = 87.85 : x
  2. Step 2: Convert to fraction form
    331.30/496.92 = 87.85/x
  3. Step 3: Cross multiply
    331.30x = 496.92 × 87.85
  4. Step 4: Simplify right side
    331.30x = 43,652.85
  5. Step 5: Solve for x
    x = 43,652.85/331.30
  6. Step 6: Final answer
    x = 131.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.